In June 2025, Artem Melnikov enhanced the dotnet/orleans repository by developing a snapshotting-based ObserverManager to address concurrency challenges during enumeration. By introducing a mechanism that safely handles modifications such as subscriptions and unsubscriptions while iterating, Artem reduced the risk of runtime errors in high-concurrency scenarios. The implementation leveraged C# and applied asynchronous programming and design patterns to ensure thread safety. Comprehensive unit tests were added to validate concurrent modification behavior and edge cases, demonstrating a thorough approach to reliability. This work laid a solid foundation for future concurrency improvements and improved the robustness of observer patterns in Orleans.